h rows=no来得到，但它的输出因为格式的问题并不能直接拿来用。而另一种方法就是写复杂的脚本来查询数据字典，但这对于一稍微复杂的对象，如IOT和嵌套表等，还是无法查到。
9i中，我们可以直接通过执行dbms_metadata从数据字典中查处DDL语句。使用这个功能强大的工具，我们可以获得单个对象或整个SCHEMA的DDL语句。最好
set heading off;
set echo off;
Set pages 999;
set long 90000;
spool get_single.
SQL select dbms_metadata.get_ddl('TABLE','SZT_PQSO2','SHQ
Sys')
From dual;
select dbms_metadata.get_ddl('INDEX','INDXX_PQZJYW','SHQSYS') f
rom dual;
spool off;
SQL> select dbms_metadata.get_ddl('TABLE','SZT_PQSO2','SHQSYS') from dual;
CREATE TABLE "SHQSYS"."SZT_PQSO2"
( "PQBH" V
ArchAR2(32) NOT NULL ENABLE,
"ZJYW" NUMBER(10,0),
"CGSO" NUMBER(10,0) NOT NULL ENABLE,
"SOLS"
VARCHAR2(17),
"SORQ" VARCHAR2(8),
"SOWR" VARCHAR2(8),
"SOCL" VARCHAR2(6),
"YWHM" VARCHAR2(10),
"YWLX" VARCHAR2(6)
) PCTFREE 10 PCTUSED 40 INITRANS 1
;mAXTRANS 255 NOCOM
Press LOGginG
STORAGE(INITIAL 1048576 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
TABLESPACE "DATA1"
SQL> select dbms_metadata.get_ddl
('INDEX','INDXX_PQZJYW','SHQSYS') from dual;
CREATE INDEX "SHQSYS"."INDXX_PQZJYW" ON "SHQSYS"."SZT_PQSO2" ("ZJYW")
PCTFREE 10 INITRANS 2 MAXTRANS 255
STORAGE(INITIAL 1048576 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
TABLESPACE "DATA1"
SQL>
SQL> spool off;
set pagesize 0
set long 90000
set feedback off
set echo off
spool get_schema.sql
connect shqsys/shqsys@hawk1;
SELECT DBMS_METADATA.GET_DDL('TABLE',u.table_n
ame)
FROM USER_TABLES u;
SELECT DBMS_METADATA.GET_DDL('INDEX',u.index_name)
FROM USER_INDEXES u;
spool off;
nts and dba_cons_columns来确定各表之间的顺序，不再详述